TCP SYN (p0f)

4:45+19:0:1400:mss*44,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-29 23:30 · last seen 2026-10-28 05:12 · JSON

Last 7 days (4 observations)

Distinct clients per day (last 30 days, peak 3/day)

Distinct clients are counted by IP-hash per complete UTC day — unlike observation counts this is insensitive to one chatty client, but NAT merges clients and address rotation splits them.

Decomposed attributes

IP version4
Initial TTL45+19
Options length0
MSS1400
Window sizemss*44
Window scale7
Options layoutmss,sok,ts,nop,ws
Quirksdf,id+
Payload class0

Co-observed signals

Signals from other families seen in the same observation. A fingerprint spread thinly across many lower-layer signatures is a classic inconsistency signal.

TLS ClientHello (JA4)

fingerprintco-occurrences
t13d4412h1_fd39b124ee10_58ed7828516f24
t13d1515h1_8daaf6152771_de4a06bb82e311
t13d3714h1_91ec122131b4_97a66a8f4cb17
t13d131100_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.4
t13d1515h1_8daaf6152771_0a20fe35d3a54
t13d1516h2_8daaf6152771_02713d6af862 Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 134.0.6998.35, chromium 133.0.6943.16.The fingerprint page shows the full measured match list. More on the catalog.1
t13d871100_c66346c74e42_ec21bdc2dd351
t13d1517h2_8daaf6152771_fca9c764716e1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.27
ge11nn13enus_9db22d02e17a_000000000000_00000000000012
he11nn050000_b223a0ebb0b5_000000000000_0000000000004
ge11nn14enus_4a2973d235de_000000000000_0000000000003
ge11nr19dede_4e9b73ab7510_000000000000_0000000000002
ge11nn020000_818f42cc3fd7_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: php-guzzle 8.2.0, php-guzzle 8.1.0, php-guzzle 8.3.1, +13 more.The fingerprint page shows the full measured match list. More on the catalog.1
ge20nr13enus_e2ac93ffb364_000000000000_0000000000001
ge20cr010000_379fadc6c8b7_000000000000_0000000000001
ge11nr17enus_021c223ca66c_000000000000_0000000000001
ge11nr16zhtw_3dfdba18536b_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 151.0.7922.34, chrome 151.0.7922.137, +60 more.The fingerprint page shows the full measured match list. More on the catalog.2

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1400_753

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (iPhone; CPU iPhone OS 16_1_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.1 Mobile/15E148 Safari/604.1 OPT/3.4.07
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 Edg/145.0.0.01
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
BR · Brazil11
ZA · South Africa8
JP · Japan7
DZ · Algeria4
AR · Argentina3
CL · Chile3
OM · Oman3
CO · Colombia2
EC · Ecuador2
CH · Switzerland1

Network (ASN)

fingerprintco-occurrences
AS2516 · KDDI CORPORATION7
AS37105 · RAIN GROUP HOLDINGS (PTY) LTD7
AS36947 · Telecom Algeria4
AS28885 · OmanTel NAP3
AS20207 · Gigared S.A.2
AS265278 · ZAAPNET TELECOMUNICACOES LTDA2
AS402253 · SKN Subnet & Telecom Ltd1
AS8708 · DIGI ROMANIA S.A.1
AS17072 · TOTAL PLAY TELECOMUNICACIONES, S.A.P.I. DE C.V.1
AS7418 · TELEFÓNICA CHILE S.A.1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 158.0.1, firefox 157.0, firefox 157.0.1, +5 more.The fingerprint page shows the full measured match list. More on the catalog.4
0a0a,001d,0017,00181